package chapter10;
import sun.awt.geom.AreaOp;

import java.sql.*;
import java.util.Scanner;

public class Demo1 {
    public static void main(String[] args) throws SQLException{
        //修改用户名和密码
        /**
         * 1.注册驱动
         * 2.获取连接
         * 3.创建表对象
         * 4.执行SQL语句
         * 5.操作结果
         * 6.关闭连接
         */
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            Class.forName ("com.mysql.cj.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, username, password);
            /**
             *  静态SQL语句用 Statement
             *  动态SQL语句用 PreparStatement
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入你的旧账户名：");
            String n1 = sc.next();
            System.out.println("请输入你的旧密码名：");
            String p1 = sc.next();
            System.out.println("请输入你的新账号名：");
            String n2 = sc.next();
            System.out.println("请输入你的新密码名：");
            String p2 = sc.next();
            String updateSQL = "update users set name= ?, and password=? where name=? and password=?";
            PreparedStatement ps = conn.prepareStatement(updateSQL);
            ps.setString(1,n2);
            ps.setString(2,p2);
            ps.setString(3,n1);
            ps.setString(4,p1);
            int res = ps.executeUpdate();
           // System.out.println(res);
            if(res>0){
                System.out.println("账号密码哦更新成功");
            }else {
                System.out.println("账号密码更新失败");
            }

        } catch (ClassNotFoundException e) {
            e.fillInStackTrace();
        } finally {
            if (rs !=null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                conn = null;
            }
        }

    }
}
